Marleigh and I did this last year for Daddy! Used this idea to make two valentine crafts/gifts. I used a paintbrush to put the paint on the feet first. Footprint Heart Valentine's Day Keepsake Grandparents Gift for Valentines Day.
Maybe a class project for Valentine's Day? Teacher could trace arm/hand for trunk and each child can find red/pink in magazine, trace a heart and cut out. Tree of Hearts collage made of old magazines. Trace hand and arm for the stem.